JPH0531060B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Field The present invention is a combination of an instantaneous water heater and a bath pot, which adds the capacity of the bath pot to the capacity of the instant water heater.
This relates to an automatic hot water bath pot that has a large capacity and pours hot water at an appropriate temperature into the bathtub (hereinafter referred to as pouring), and automatically stops when the appropriate amount is reached. Conventional technology The method of pouring moderately hot water heated with an instantaneous water heater from above the bathtub by opening the lid of the bathtub has the disadvantages of heat dissipation during pouring and the need to close the lid after pouring the hot water. Nowadays, the method is to send suitably warm water heated by an instantaneous water heater into the bathtub with the bathtub lid closed through the circulation outlet pipe or circulation inlet pipe of the attached bathtub. This reduces heat radiation during pouring and saves time and effort. A water level sensor connected to the bathtub heat exchanger detects the amount of hot water in the bathtub, and when the temperature reaches an appropriate temperature, the pouring of hot water automatically stops. That is, as shown in FIG. 2, a hot water pouring pipe 14 is provided at one end of the hot water supply pipe 10 of the instantaneous water heater 2 via a solenoid valve 13 for pouring hot water, and a plurality of hollow plates 40 are connected to the hot water pouring pipe 14. A bathtub 3 having a plate-fin type heat exchanger with fins 19 connected thereto.
The circulation outlet pipe 22 is in open communication with a funnel 24 at the tip of a riser pipe 23 provided vertically. A water level sensor 29 is provided in the water can portion 28 of the bathtub 3. (For example, Japanese Utility Model Application Publication No. 59-133942) Problems to be Solved by the Invention In order to pour a large amount of water at an appropriate temperature into the bathtub and shorten the pouring time, the ability of an instantaneous water heater is essential. There are two methods: one is to increase the capacity of an instant water heater and the other is to increase the capacity by adding the capacity of a bath pot to the capacity of an instant water heater and pour hot water. The former is
The result will be as shown in the table below.

[Table] If the capacity of the instantaneous water heater is No. 17 (generally the highest capacity type), it will be approximately 11/M at 38deg. On the other hand, if you try to increase the flow rate by 30% and secure a flow rate of 15/M in order to shorten the time, the capacity will become 23 and it will be necessary to increase the size by 6 sizes. As described above, as the instantaneous water heater becomes larger, the size of the device becomes larger, which goes against the need for space saving, and there is a problem in that the cost of the device also increases. In the latter type, a plate-fin type heat exchanger in which a plurality of hollow plates 40 are arranged side by side and fins 19 are connected to the hollow plates 40 is used as a general bathtub. In this case, in order to rewarm the suitable temperature water heated in the instantaneous water heater in the bath pot, it is necessary to evenly distribute the hot water from the riser pipe 23 to the plurality of hollow plates 40 arranged in parallel. . If the temperature is not uniform, the temperature after heating in the bath pot may not be constant, or the hollow plate 40 may become uneven.
If the amount of hot water is too small, the quality will be impaired, such as partially boiling the boiling water, or even if the boiling water does not reach dry boiling, the boiling water will boil in some areas. In order to avoid this, a plurality of riser pipes 23 are provided and the riser pipes 23 are evenly distributed to the plurality of hollow plates 40 arranged in parallel.
The structure is complicated, making it difficult to put it into practical use. The present invention does not increase the capacity of the instantaneous water heater (for example, by keeping the size 17), but by adding the capacity of the bath boiler to a single-tube heat exchanger, the capacity of the bath boiler can be increased. This makes it possible to pour hot water in a short time. Means for Solving the Problems In order to solve the above problems, the present invention combines a bath heat exchanger equipped with a riser pipe with a funnel at its tip and an instantaneous water heater. Branching the hot water supply pipe of the boiler and communicating one side with a hot water outlet pipe having a hot water tap and the other side with a hot water pouring pipe having a solenoid valve for pouring hot water, and connecting the hot water pouring pipe with the funnel, The heat exchanger includes an inlet water can part having a circulation inlet pipe and an outlet water can part having a circulation outlet pipe,
The inlet water can part and the outlet water can part are connected sequentially from the outlet water can part side through a heat transfer tube, an intermediate water can part, and a rectangular pipe, and one side wall of the outlet water can part is connected to the downstream side of the riser pipe. The side tip portion faces the heat exchanger tube, and the heat transfer tube faces the other side wall opposite to the one side wall, and the outlet water can portion is located above and perpendicular to the downstream tip portion of the riser tube. A circulation outlet pipe is provided on the side wall, a water level sensor is provided in the outlet water container portion, and a temperature sensor is provided in the inlet water container portion. Function When pouring hot water into the bathtub, the hot water obtained from the instantaneous water heater is sent to the heat exchanger tube via the outlet water tanker of the bathtub heat exchanger and reheated by the heat exchanger tube. , an intermediate water can, a rectangular pipe, an inlet water can, and a circulation inlet pipe into which hot water is poured into the bathtub. especially,
Instead of multiple heat exchanger tubes installed side by side as in the past, it is a single tube type heat exchanger tube, which allows for uniformity and smooth pouring of the metal. (However, as the water level in the bathtub rises, hot water will be poured from the circulation outlet pipe.) At this time, a temperature sensor controls the capacity of the instantaneous water heater to pour hot water at the desired pouring temperature, and a water level sensor stops pouring at the desired pouring amount (water level). . This makes it possible to increase the capacity and pour hot water at an appropriate temperature in a short time, and also to automatically stop pouring when the appropriate amount is reached. Embodiment An embodiment of the present invention will be described based on FIG. In the figures, the same parts as those in the conventional example shown in FIG. 2 are given the same numbers. In FIG. 1, an automatic hot water bath pot 1 of the present invention combines an instantaneous water heater 2 and a bath pot 3. The instantaneous water heater 2 is composed of a drum section 5 having a drum pipe 4, a fin pipe 6, and a fin block 8 having an endothermic fin 7, and a water supply pipe 9, drum pipe 4, fin pipe 6, and hot water supply pipe 10 are connected to each other. The tip of the hot water supply pipe 10 is branched into a hot water tapping pipe 12 having a hot water tap 11 and a hot water pouring pipe 14 having a solenoid valve 13 for pouring hot water. The bath pot 3 includes a circulation inlet pipe 15, an inlet water can part 16,
A rectangular tube 17, an intermediate water can part 18, a heat transfer tube 20 having heat absorption fins 19, an outlet water can part 21, and a circulation outlet pipe 22 are arranged in this order. The downstream end of the riser pipe 23 is connected to the side wall of the outlet water can part 21, and the heat exchanger tube 20 is also connected to the other side wall of the outlet water can part 21, and the end part and the heat exchanger tube 20 are disposed opposite to each other. . Further, the upstream tip of the riser pipe 23 is provided with a funnel 24 at the tip thereof in the vertical direction to a higher position than the instantaneous water heater 2 and the bathtub 3. The pouring pipe 14
is in open communication with this funnel 24. The water level sensor 29 is provided in communication with the outlet water can part 21. Further, the temperature sensor 30 is provided near the circulation inlet pipe 15 of the inlet water can section 16. The fuel circuit 31 has one end connected to the instantaneous water heater burner 25 via an instantaneous water heater gas solenoid valve 32 and a proportional control valve 33, and the other end connected to the instantaneous water heater gas solenoid valve 34.
It is connected to the bathtub burner 26 via. The water supply circuit 35 is connected to the water supply pipe 9 of the instantaneous water heater 2 via a water governor 36 and a running water switch 37, and is also connected to the water supply pipe 10 provided downstream of the fin pipe 6.
is equipped with a temperature sensor 38. Furthermore, the automatic hot water bath pot 1 has a bulkhead plate 27,
The instantaneous water heater 2 and bath pot 3 are separated, and an electric controller 39 is built-in. The present invention has the above-described configuration, and its operation will be explained next. When pouring hot water at an appropriate temperature into the bathtub, if there is no remaining hot water in the bathtub and the hot water tap 11 is closed, turn on the automatic operation switch (not shown), and the solenoid valve 13 for pouring hot water will open. When water flows from the water supply circuit 35, the water flow switch 37 detects it, the electric controller 39 operates, and the gas solenoid valve 32 for the instantaneous water heater opens, and at the same time, the igniter (not shown) operates to activate the instantaneous water heater. Burner 25 ignites. After ignition,
The heat is absorbed by the heat absorption fan 7 and the hot water is heated in the following order: the solenoid valve 13 for pouring hot water at one end of the hot water supply pipe 10, the oil supply pipe 14, the funnel 24, the riser pipe 23, the outlet water can part 21, and the heat transfer pipe 20. sent. At this time, the gas solenoid valve 34 for the bath kettle opens by detecting the opening of the solenoid valve 13 for pouring hot water, and at the same time, the igniter is activated and the burner 26 for the bath kettle is ignited.
The intermediate water can part 1 is reheated by the heat transfer tube 20.
8. The hot water is poured into the bathtub from the circulation inlet pipe 15 via the rectangular pipe 17 and the inlet water can part 16. At this time, the temperature sensor 30 sends a signal to the proportional control valve 33 of the instantaneous water heater 2 via the electric controller 39 so that the pouring temperature reaches the desired temperature, which is expressed as a ratio of maximum capacity or minimum capacity. This controls the selection of one of the TDRs. In this way, hot water at the desired temperature is accumulated in the bathtub at a large capacity and large flow rate, which is a combination of the capacities of the instantaneous water heater and the bath pot.When the hot water in the bathtub reaches the desired amount (water level), the water level sensor 29 is activated, and the solenoid valve 1 for pouring
3 is closed, water flow through the water supply circuit 35 is stopped, the instantaneous water heater gas solenoid valve 32 is closed, the instantaneous water heater burner 25 is extinguished, and the hot water pouring solenoid valve 1 is closed.
3, the bathtub gas solenoid valve 34 is closed and the bathtub burner 26 is also extinguished. In other words, just by turning on the automatic operation switch, the appropriate amount of hot water at the appropriate temperature is poured into the bathtub in a short period of time. In realizing this hot water pouring configuration, it cannot be achieved simply by passing hot water from the instantaneous water heater 2 through the bathtub heat exchanger 3. For example, (i) heat exchanger tube 2
It is assumed that the heat exchanger configuration is such that the amount of heat transfer within 0 can be obtained as predicted. This is because the water flow rate and bath pot capacity are clear, and the heat exchange efficiency is known, making it possible to predict the temperature of water poured into the bathtub rather than through the circulation inlet/outlet pipe. (ii) In the bath kettle heat exchanger 3, when heating the bath (described later), water flows from the circulation inlet pipe 15 and convects toward the circulation outlet pipe 22, but when pouring, the flow is reversed, that is, from the heat transfer pipe 20. Convection flows toward the circulation inlet pipe 15, from the circulation inlet pipe 15 of the heat exchanger 3 to the circulation outlet pipe 22, and from the circulation outlet pipe 22 to the circulation inlet pipe 15.
The premise is that the circuit configuration is such that water flows in one direction. Unless the above prerequisites are satisfied, it will not be possible to pour the metal at an appropriate temperature and to minimize the occurrence of the kettle rattling phenomenon. On the other hand, as is clear from FIG. 1 of the example,
The circulation outlet pipe 22 is disposed at a position above and perpendicular to the downstream end of the riser pipe 23 communicating with the outlet water can part 21, and furthermore, the heat exchanger pipe communicating with the outlet water can part 21 20 to the circulation outlet pipe 2
2 and facing the downstream end of the riser pipe 23. As a result, when pouring hot water, the hot water sent from the downstream end of the riser pipe 23 is transferred to the outlet water can part 21 and the heat transfer tube 2 when there is no hot water in the bathtub (not shown).
0, intermediate water can part 18, rectangular pipe 17, inlet water can part 1
6. It is sent into the bathtub via the circulation inlet pipe 15. At this time, the heat exchanger tube 20 reheats the water and sends it into the bathtub at a high capacity. After that, when hot water accumulates in the bathtub, some of it will be sent into the bathtub from the annular outlet pipe 22, but as a general rule, the total amount of hot water poured into the bathtub is determined by the large capacity injection. The circuit is configured in the following order: the annular outlet pipe 22, the outlet water can section 21, the heat transfer tube 20, the intermediate water can section 18, the rectangular tube 17, the inlet water can section 16, and the circulation inlet pipe 15. By doing so, water flows smoothly from the circulation outlet pipe 22 of the heat exchanger 3 toward the circulation inlet pipe 15, and the preconditions are satisfied. In the case of shower hot water supply, when the hot water tap 11 is opened, water starts flowing from the water supply circuit 35, and the hot water tap 1 is opened in the same way as the instantaneous water heater 2 operates when pouring hot water.
Hot water is supplied from 1. At this time, the electric controller 3 controls the temperature sensor 38 so that the hot water temperature reaches the desired temperature.
9 to the proportional control valve 33 to express the maximum capacity or the ratio of the maximum capacity to the minimum capacity.
You can control the selection of TDR to supply hot water at the appropriate temperature. Furthermore, even when the hot water tap 11 is opened for shower hot water supply when pouring hot water into the bathtub,
The hot water supply pipe 10 is branched into a hot water pouring pipe 14 via a hot water outlet pipe 12 and a solenoid valve 13 for pouring hot water, allowing simultaneous use of hot water supply and pouring. In addition, when heating the bath, the hot water pouring solenoid valve 13 and the hot water tap 11 are closed, and when the bath operation switch (not shown) is turned on, the bath pot gas solenoid valve 34 opens and the hot water pouring tap 11 is closed. The bath burner 26 is ignited in the same manner as before. After ignition, heat absorbing fin 1
9, the water or low-temperature hot water in the heat transfer tube 20 is heated.
5, inlet water can part 16, rectangular pipe 17, intermediate water can part 1
8. Natural convection occurs toward the heat exchanger tube 20 and the outlet water can part 21, and circulation heating is performed from the circulation outlet tube 22 toward the bathtub. Furthermore, in the present invention, a water level sensor is provided in an outlet water can part that is connected to a heat transfer tube and has a circulation outlet pipe. As a result, even if bubbles occur, they will flow smoothly toward the bathtub through the circulation outlet pipe provided in the outlet water can. Therefore, the water level sensor will not malfunction due to air bubbles. In addition, the temperature sensor is installed in the inlet water can, and when detecting the temperature, there is no contact with air bubbles in the hot water, so the detected temperature does not change and does not lead to malfunction. . Effects of the Invention The automatic hot water bath pot of the present invention provides the following effects. (1) The tip of the riser pipe is connected to the heat transfer tube via the outlet water can, and the water level sensor is installed in the outlet water can to prevent air bubbles from forming inside the heat transfer tube when heating the bath. It is not affected by water levels and unstable water levels cannot be detected. (2) By providing the temperature sensor in the inlet water can section having the circulation inlet pipe, it is similarly not affected by air bubbles generated in the heat transfer tube when heating the bath, and unstable temperatures are not detected. (3) It is extremely convenient because it automatically pours the desired amount of hot water at the desired temperature in a short period of time until it is ready for bathing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an automatic hot water bath pot according to an embodiment of the present invention, and FIG. 2 is a perspective view of a conventional example. 1...Automatic hot water bath pot, 2...Instant water heater, 3
... Bath pot, 10 ... Hot water supply pipe, 13 ... Solenoid valve for pouring hot water, 14 ... Hot water pouring pipe, 15 ... Circulation inlet pipe, 1
6...Inlet water can part, 20...Heat transfer tube, 21...Outlet water can part, 22...Circulation outlet pipe, 23...Rise pipe, 25...Burner for instantaneous water heater, 26...Bath pot burner, 29...water level sensor, 30...temperature sensor, 39...electric controller.

Claims (1)

[Claims] 1. A heat exchanger for a bath equipped with a riser pipe having a funnel at the tip and an instantaneous water heater are combined, and the hot water supply pipe of the instantaneous water heater is branched and one end is connected to a hot water outlet pipe having a hot water tap. , and the other end is connected to a pouring pipe having a solenoid valve for pouring hot water, and the pouring pipe is in open communication with the funnel, and the heat exchanger has an inlet water can part having a circulation inlet pipe and a circulation outlet pipe. the inlet water can part and the outlet water can part are connected in sequence from the outlet water can part side through a heat transfer tube, an intermediate water can part, and a rectangular tube, and the outlet water can part The downstream end of the riser pipe is made to face one side wall, and the heat exchanger tube is made to face the other side wall facing the one side wall, and the part is above the downstream end of the riser pipe and is perpendicular to the other side wall. A circulating outlet pipe is provided on a side wall of the outlet water can part at a position where the water can flow, a water level sensor is provided in the outlet water can part, and a temperature sensor is provided in the inlet water can part.